As a compulsive upvoter, I've struggled with this dilemma.
I often have to remind myself that upvoting everyone means upvoting no-one.
Fortunately there's usually a Guardian link or two for me to ignore.
If you upvote everyone, are you really upvoting anyone?
Well ppl need an extra vote to break out of the new queue on most subs, unless the owner has set default as new. Also I like to mark off things I've read and the vote button is handy for that. So I guess I'm that guy that voted on your shit if you only get 2 votes. If the board gets much busier I'll have to reconsider things.
If you upvote everyone, are you really upvoting anyone?
Except the dirty cabbage folks, you're definitely effectively downvoting them.